. >>> vice president joe biden is in japan this morning. new u.s. ambassador caroline kennedy greeted biden when he arrived in tokyo. biden says the u.s. is trying to lower tensions in the region after china suddenly declared an air defense zone in the east china sea. he plans to bring it up when he meets with china's president tomorrow. seth done in beijing. good morning. >> reporter: good morning to you, norah. the vice president traveled here to asia to talk about trade and economic issues but that conflict over the air defense zone will likely dominate his trip. just a couple hours ago, he reiterated u.s. support for its ally japan. the vice president continued his week-long tour in asia today alongside japan's prime minister. it signals the early stages of a delicate balancing act for the u.s. amid international protest over china's newly declared air defense zone. biden addressed the conflict this morning. >> we the united states are deeply concerned by the attempt to unilaterally change the status quo in the east china sea. this action has ra